Certainly there are many apples to oranges differences, but I don't think it's fair to discount the "managed" nature of mobile devices as a component of their success.
The uptake in Chromebooks would be semi-supporting as well.
Chrome books are also very cheap, bust still no where near as popular as phones.
Also, laptops with wwan cards are a thing, but they also coat more, aren't a default, and can't just be bought at a conveniently located store. It also doesn't fit in my pocket or last nearly all day on a charge.
Certainly there are many apples to oranges differences, but I don't think it's fair to discount the "managed" nature of mobile devices as a component of their success.
The uptake in Chromebooks would be semi-supporting as well.